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Herrenknecht AG to construct the remaining two TBMs.

Slurry TBMs will be used to construct the 2.6 km twin bore Thames Tunnel due to the chalk ground conditions in this part of the capital. The remainder of the tunnels, between Royal Oak, Pudding Mill Lane and Victoria Dock Portal will be constructed using Earth Pressure Balance Machines which will pass through ground which is predominantly London clay, sand and gravels. The Slurry TBMs will be launched from Plumstead Portal in late 2012 and will tunnel westwards towards North Woolwich. Constructon of Plumstead Portal is now underway with work for North Woolwich Portal commencing in early 2012.

The frst two Crossrail TBMs are currently being manufactured. Factory assembly of these TBMs begins in October and will complete during November. The tunnel boring machines will then be factory tested before being dis-assembled in readiness for shipping to London. The frst TBM components will begin arriving in the UK at Tilbury Docks in December with the second TBM arriving later in January. The TBM components will be transported to Westbourne Park for re-assembly.

Herrenknecht AG wi l l also del iver two TBMs to Limmo Peninsula for the eastern running tunnels in mid 2012, two machines to Stepney Green and two machines to Plumstead later in 2012. The TBMs required for Crossrail will be up to 120 m in length and weigh around 850 tonnes.

Page 14 Contractors World - UK & Ireland Vol 1 No 6

For the pumping staton at Royal Park, a small tunnelling machine was required, but much large TBMs from Germany will be used for the main tunnels.

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